A **T-network** is a flexible impedance matching circuit using two capacitors and one inductor in a "T" configuration. It is commonly found in manual antenna tuners due to its wide matching range and ability to handle both step-up and step-down transformations.

This calculator estimates component values assuming a **high-pass T-network** configuration:

• Capacitor C₁ in series with the source
• Inductor L to ground (shunt leg)
• Capacitor C₂ in series to the load

Given a source impedance \( Z_s \) and load impedance \( Z_l \), the quality factor is: \[ Q = \sqrt{\left| \frac{Z_{\text{high}}}{Z_{\text{low}}} - 1 \right|} \] Then: \[ X_L = Q \cdot Z_{\text{low}}, \quad X_C = \frac{Z_{\text{high}}}{Q} \] Which leads to: \[ L = \frac{X_L}{2\pi f}, \quad C = \frac{1}{2\pi f X_C} \]

Use these values as a starting point and fine-tune with your tuner or analyzer.